/Engine/Source/Runtime/Landscape/Public/LandscapeConfigHelper.h
static bool ChangeGridSize ( [ULandscapeInfo](API\Runtime\Landscape\ULandscapeInfo) * InLandscapeInfo, uint32 InNewGridSizeInComponents, [TSet](API\Runtime\Core\Containers\TSet)< [AActor](API\Runtime\Engine\GameFramework\AActor) * > & OutActorsToDelete )